Merged versions from CY49T2 and CY49R1 for CY50

[AlexandreMary]

This series of commits results from changes commited in ectrans for CY49T2, merged with the version of ectrans from CY49R1 (in the contrib/ directory of ifs-source).

The final commit 00cdb6e, tagged for-CY50 in ACCORD-NWP fork of ectrans, is the version bundled for CY50 at first (a version merged with a more recent version of ectrans, could be later bundled).

Note: past CY50, contributions from ACCORD consortium or MF to ectrans will be PR'ed directly and without so much delay to the main branch of this repo.

[FussyDuck]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
2 out of 5 committers have signed the CLA.

✅ AlexandreMary
✅ ddegrauwe
❌ Daan Degrauwe
❌ RyadElKhatibMF
❌ walidchikhi

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[samhatfield]

Hi @AlexandreMary - I have merged your branch with develop to remove the conflicts, and opened a new PR. If it's okay with you, I'll close this PR so we can discuss the changes in the other PR.

[AlexandreMary]

OK Sam, thanks